The green colour produced in the borax bead t | vedclass

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Question

(A) In the borax bead test,the chromium $(III)$ salt decomposes upon heating to form chromium $(III)$ oxide $(Cr_2O_3)$.Borax $(Na_2B_4O_7 \cdot 10H_2

Vedclass · Accepted Answer

$Cr(BO_2)_3$

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(A) In the borax bead test,the chromium $(III)$ salt decomposes upon heating to form chromium $(III)$ oxide $(Cr_2O_3)$.Borax $(Na_2B_4O_7 \cdot 10H_2O)$ on heating loses water and forms sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$.The reaction is: $Cr_2O_3 + 3B_2O_3 \longrightarrow 2Cr(BO_2)_3$.The green colour is due to the formation of chromium metaborate,$Cr(BO_2)_3$.

The green colour produced in the borax bead test of a chromium$(III)$ salt is due to formation of . . . . . . :

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